Years passed since Scrum had been widely adopted in software world. I’m wondering if there is any efficiency survey done by more or less independent people/institutes. Obviously scrums gurus who travel around the globe giving lectures and training always find numbers of excellent showcases, however I’d rather listen someone who doesn’t sell Scrum.

By efficiency I mean total productivity (delivered value/cost), but not some internal characteristics like communications inside teams and so on.

Update based on discussion in comments:

One of the ways to do such survey/analysis could be based on comparison of similar projects developed with Scrum and without Scrum. I believe even 10 years ago there were projects similar to some current. Of course, it does not make sense if applied technologies are completely different, so these projects have to be implemented on same/similar technology.

"widely adopted" isn't enough proof? What more do you hope to learn? We're not using scrum because it's stylish or because of a compulsion or regulation. It's widely adopted because it works. Please detail something you need to know more than "widely adopted".
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S.LottApr 15 '11 at 10:55

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@S.Lott "widely adopted" is not empirical proof of anything other than popularity, it is perfectly reasonable to ask for references that relate to delivered value etc. Waterfall or RUP could also be said to be "widely adopted", it would be interesting to see research comparing them all.
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Steve HaighApr 15 '11 at 11:17

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@S.Lott Many religions were widely adopted during humankind history. So it doesn’t really mean much. Scrum as a software development process is supposed to improve this development i.e. companies should spend less money for the same result now comparing to what was 10 years ago. Of course, it’s not easy to calculate efficiency since, everything is changing with time and projects are never exactly the same. But still I’m sure that it's possible to find some similar projects made 10 years ago and now.
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Mark BLNKNApr 15 '11 at 11:21

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@S.Lott: Smoking is widely adopted. No one is compelled to smoke. Smokers must be happy, otherwise they'd quit smoking. So smoking is healthy.
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Joonas PulakkaApr 15 '11 at 11:46

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@S.Lott, I think cowboy coding is even more widely adopted than Scrum, but I don't see anybody claiming that that works.
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Carson63000Apr 15 '11 at 12:20